Materials Literature
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Poly(hydroxybutrate-co-hydroxyvalerate) (PHBV) fibrous membranes were fabricated through electrospinning. The effects of polymer solution properties including solution concentration and salt addition were investigated such that uniform fibers with diameters ranging from several hundred nanometers to a few micrometers…
Abstract We developed a 2 inch low temperature poly‐Si active‐matrix organic light‐emitting diode (AMOLED) with an embedded p‐i‐n photodiode. The pixels for both OLED and photodiode are designed using poly‐Si TFT and poly‐Si p‐i‐n. The lateral p‐i‐n photodiode exhibited the photo response of ∼40 dB under 100 lux. We h…
Nanowire arrays of CIS were formed inside porous alumina templates by pulsed potential electrodeposition. Close to stoichiometric CIS phase in a chalcopyrite crystal structure with a = 5.782 Å and c = 11.619 Å. was obtained. Atomic weight fractions of Cu, In and Se were 20%:38%:42%. Arrays of cadmium sulfide nanowire…
The effect of sulfization temperature on Ga through-film uniformity in a 2-reaction H2Se/H2S precursor process for Cu(InGa)(SeS)2was studied. Cu0.8Ga0.2/In bi-layer precursors were prepared by sputter deposition. The precursors were then partially selenized at 450 °C, followed by sulfization at temperatures ranging fr…
This paper describes a systematic experimental and numerical study of the thermal characterization of a flip-chip package. A cold-plate based test method is used for thermal characterization and internal thermal resistance is used as the basis of all comparisons. Experiment results are presented for three flip-chip pa…
Polymer materials - mainly epoxy resins - are widely used in microelectronics packaging. They are established in printed circuit board manufacturing, for adhesives as die attach glues or for encapsulants as molding compounds, glob tops or underfill materials. Low cost and mass production capabilities are the main adva…
4.5 kV 1000 A class high heat resistive SiC pn diode modules of both a resin mold package type using a new mold resin, Nanotec-resin KA 500, and a ceramic flat package type using a new ACTSG technique were developed for the first time. The resin mold module has a much smaller trr and Qrr in addition to higher Tj (max)…
The purpose of this paper is about a new design and construction of a very low frequency (VLF) high voltage generator. The VLF generates a sinusoidal waveform at 0.1 Hz. It consists of two main parts, a modulation unit and a high voltage switching unit. The modulation unit is compared the 0.1 Hz sinusoidal waveform an…
Perovskite-type LSM and LSCF deposits were developed for oxygen electrode for solid oxide fuel cell and high temperature water electrolyzer by atmospheric plasma spraying (APS) using different feedstock powders. The deposits were tailored to exhibit high oxygen catalytic activity, oxygen surface exchange and diffusion…
An electron beam (EB) lithography technique to form patterns directly on a semiconductor crystal surface, without using a resist or an oxide film, combined with molecular beam epitaxy (MBE) growth is described for potential applications to site definition of quantum dots. Periodically arranged submicrometer protrusion…
Effects of 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) doping on the hole conductivity of Alq 3 layer are measured. In the hole-only device of Alq 3 , the current densities increase in 1–3 orders of magnitude upon doping with F4TCNQ, suggesting that the doping can effectively enhance the hole-injecti…
Abstract magnified image (E,E,E)‐2,4,6‐Tris(styryl)pyridines 2a‐c with 3, 6 or 9 dodecyloxy substituents were prepared by the highly stereoselective condensation reaction of collidine (8) and the corresponding phenyl‐(1‐phenyl‐methylidene)amines 7a‐c (Siegrist reaction). In contrast to the corresponding compounds with…
Strengthening of Fe-Cu alloys during isothermal aging has been considered. The size of particles that provides a maximum strength has been found. A theory of particle growth under the conditions of continuous cooling has been developed. The cooling rate that provides the maximum contribution from age hardening has bee…
With the concourse of a variety of experimental techniques (neutron diffraction, x-ray photoelectron spectroscopy, $^{13}\text{C}$ nuclear magnetic resonance, electron microscopy, and Raman spectroscopy) and a combination of reverse Monte Carlo, molecular dynamics, and Monte Carlo simulations, we propose a model for t…
In this work with the help of the phenomenological Ginzburg-Landau theory of structural and magnetic phase transitions the phase diagrams of Heusler Ni-Mn-X (X = In, Sn, Sb) alloys with the inversion of exchange interaction are investigated. The investigation shows that the type of the phase diagrams in Heusler Ni-Mn-…
GaAs thin film has been grown on porous silicon by metal organic chemical vapour deposition (MOCVD) for different growth temperatures using atomic layer epitaxy (ALE) technique. The morphology of GaAs layer was investigated by atomic force microscopy (AFM). The effect of growth temperature is studied using photolumine…
This paper describes an electrochemical method which permits us to transform solid metals (cobalt, iron or nickel) into nanoparticles. An electrolysis cell is made, the anode being a metal bar and the cathode a mercury layer. Magnetic nanoparticles are obtained in one step by electroreduction of mercury. Electrolysis…
Four three‐ring compounds, consisting of two cyclohexyl rings and one mono‐ or difluorinated phenyl ring, were studied using dielectric spectroscopy methods over a broad frequency range (1 kHz–3 GHz). They exhibit a nematic phase in a broad temperature interval, enriched by a smectic B phase in one case. The static an…
Energy density is not the only metric for capacitors. In high pulse repetition rate modulators and other types of power conditioning systems, the reactive power (kVAR) is often the factor driving the physical size of capacitors. The specific power (kVAR/cm3) capability of a capacitor depends on many factors, including…
Cyclotella katiana sp. nov. is described from La Reina Swamp, Parque Nacional Natural Los Katios, Colombia. Studied samples were collected from the stomach contents of Prochilodus magdalenae (Bocachico), an iliophagous fish species. The new taxon is distinguished from the related taxa C. atomus Kutzing, C. meneghinian…